'Dropping only UDP packets in RPL

1)I am trying to drop only UDP packets in RPL in Contigi-ng OS.
I modified the code in/contiki/core/net/tcpip.c as:

...
    static void
    packet_input(void)
    {
    #if DEST_PORT_IS_MAL_DROP
    if ((UIP_IP_BUF->proto == UIP_PROTO_UDP) && 
    (uip_ntohs(UIP_UDP_BUF->destport)==UDP_MALICIOUS_PORT)){
    uip_len=0;}
    #endif
    #if UIP_CONF_IP_FORWARD
    if(uip_len > 0){
...

This drops all packets whose destport = UDP_MALICIOUS_PORT and do not know how to drop only UDP packets and allow control messages.

Thanks in advance

contikicontiki-ngrpl


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